[jboss-user] [JBoss Seam] - Re: Seam application with tree on left and editor for select

[christian.bauer@jboss.com]

This is how I get stuff into the tree:


  | package adapters;
  | 
  | import org.apache.myfaces.trinidad.model.ChildPropertyTreeModel;
  | import org.apache.myfaces.trinidad.model.TreeModel;
  | 
  | import java.util.Collection;
  | 
  | /**
  |  * Wraps a nested tree of nodes into a Trinidad TreeModel.
  |  *
  |  * The primary purpose of this adapter is to check if a node has children,
  |  * or not. The wrapped TreeModel then results in correct rendering of the
  |  * tree, either as a container or a node icon.
  |  *
  |  * See faces-config.xml for a usage example.
  |  *
  |  * @author Christian Bauer
  |  */
  | public class TreeModelAdapter {
  | 
  |     private Collection rootCollection;
  |     private String childCollectionPropertyName;
  | 
  |     public TreeModelAdapter() {}
  | 
  |     public TreeModel getTreeModel() {
  |         return new ContainerAwareChildPropertyTreeModel(rootCollection, childCollectionPropertyName);
  |     }
  | 
  |     public Collection getRootCollection() {
  |         return rootCollection;
  |     }
  | 
  |     public void setRootCollection(Collection rootCollection) {
  |         this.rootCollection = rootCollection;
  |     }
  | 
  |     public String getChildCollectionPropertyName() {
  |         return childCollectionPropertyName;
  |     }
  | 
  |     public void setChildCollectionPropertyName(String childCollectionPropertyName) {
  |         this.childCollectionPropertyName = childCollectionPropertyName;
  |     }
  | 
  |     /**
  |      * This inner class extends the built-in Trinidad TreeModel, which by default
  |      * treats every node as a container. Users have to click on a node to see
  |      * if there is something in the container, and the rendering is also wrong.
  |      * This might trigger loading of the children (the collection of children is
  |      * touched) if you have lazy loading. However, you now get correct rendering
  |      * of nodes and a regular node does no longer appear as a container.
  |      */
  |     class ContainerAwareChildPropertyTreeModel extends ChildPropertyTreeModel {
  | 
  |         public ContainerAwareChildPropertyTreeModel(Object object, String string) {
  |             super(object, string);
  |         }
  | 
  |         public ContainerAwareChildPropertyTreeModel() {
  |             super();
  |         }
  | 
  |         public boolean isContainer() {
  |             boolean hasChildren = false;
  |             // Hit the children collection of this container to
  |             // figure out if its really a container
  |             enterContainer();
  |             if (getRowCount() > 0) hasChildren = true;
  |             exitContainer();
  | 
  |             return hasChildren;
  |         }
  |     }
  | }
  | 


  | <faces-config>
  | 
  |     <!-- JSF backing beans that call Seam components, these
  |          backing beans provide an additional layer between
  |          business components managed by Seam and presentation-only
  |          beans. Common backing beans in a Seam application are
  |          model adapters (that convert from a java.util.Collection
  |          to a Trinidad TreeModel, for example).
  |      -->
  |     <managed-bean>
  |         <managed-bean-name>catalogCategoryAdapter</managed-bean-name>
  |         <managed-bean-class>adapters.TreeModelAdapter</managed-bean-class>
  |         <managed-bean-scope>request</managed-bean-scope>
  |         <managed-property>
  |             <property-name>rootCollection</property-name>
  |             <value>#{catalog.rootCategories}</value>
  |         </managed-property>
  |         <managed-property>
  |             <property-name>childCollectionPropertyName</property-name>
  |             <value>childCategories</value>
  |         </managed-property>
  |     </managed-bean>
  | ...
  | 

I guess I should use a Seam component for this last bit, instead of a dumb JSF backing bean.


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